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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5312022d062287a65e10aa304e430cab7bf8fee60ebfa4088f2d8b8b474afc' 
  AND token = 'aFY3a2X7QBoj1wb0caPXs/M0ADPQI1CUepk6i4ocXgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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