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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381b91b2b972764cb739da7eb44b1794dca82afe08c17c978fcefb9496b6548f' 
  AND token = 'luqKuxV0vhpb/8230QAu2E0iHSfzc7Uy0YiIQYND13g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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