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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9c51c112e0a22777a41d13180c377990befadc36b77ade5d791201af82495d' 
  AND token = '8mJWF7p7bPVZK/c1UTRj1wzFQnvucoFmUPRzNiiciKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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