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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f723f00ac96318c40d68b9872c1b744d8eb10117e89fac57dd08ab116bc720eb' 
  AND token = 'zwkUqbXPN46NqHvkRQ0v7SnfrkreGGbjeedyp0UyRtI=' 
  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"
    }
  }
}