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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c33c778e9b1bc770fb15740daf5b09d009195639f0df80892bde89b625d76e' 
  AND token = 'T7GJAHQ0rGb3gAi+Uyuly3KrFrfdqJWRcTQCfGfeCG8=' 
  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"
    }
  }
}