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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8d85495118ba2a1d7f0429a76b132e6952810cc8fb8965865e5f8e916429e7' 
  AND token = 'P3yeQBwvAZD6rvpYvq9uXZAm8KEbO7aBdh8B1zDe34Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00156

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}