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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43eb6411ae2a4c8695698475af51d4e34496ada7ee78c8a3e7e88463c5484b2' 
  AND token = 'Sp9wriYEfeYYy/Zq2+qUwijmj4SG6yfxh0espSjBOds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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