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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624ac553db7b21366e96830f8896bb209b12de522b8454b6d2ecdb56de9bbb18' 
  AND token = 'yWeibRH4xu/VlEKmW3PWToM2KBqPhoFs8Selb9zTA+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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