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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b4819249a8983b4d0ef08b255162eeda02be5c79e2e8dc371c25033b12122e' 
  AND token = 'NEDoj1bGzbTXr0JjGeKTT/f0gu+7pukaGA5mQKYcHSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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