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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ff34fd0b9239c182cbfe4add00e670f475cab39b7d48b47913436e9db74306' 
  AND token = '2TYQoG/MezU8op+EIvBY/3GY0xEHzbvA6PnjgZo2DC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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