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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5415f614d8dc296d8eacac84c8a017db4c668e33305fd94d6141e49ea8c4fa' 
  AND token = 'kV7gpWECTa/ItSkf+Z0uyApmM6mNqpu6CdDy5y9hGuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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