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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45e9a59fd4e80272c24472b533e113aec3d512ac130509d15ef52fc67bc6e593' 
  AND token = '6H1IRijiKkcBnkHl+EKabJjswiD2X7q8ogC93Apv2yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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