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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3208aea56231f76a5c4abb7e60f67838625d32de634f5f98e01a8e4b2d0afc' 
  AND token = 'XNtD79nW23fD/bju6bMxg4yAQTFxMMZQw/U7JZTrrBU=' 
  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"
    }
  }
}