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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a58052ed71d8223c588fd0f28732825b78d1f287d06030a77841f5b9c24ac0' 
  AND token = 'HqC0Xrswz+Kj8kkqg5hGM4+aXKfgqvysbt8Go91Q6tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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