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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d7141ba9886c2249fb0988a74fc9d3be99018f660a50507623012b11058a13' 
  AND token = 'ambMxrJuzEMSUsS5+kDPeSNWAYy87+j+DnNUmloRzhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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