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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156dbc6db9c66d288ccb89d4684eae24204b3bc06d2e9faf042d1cacac12ee99' 
  AND token = 'ZE5hJvtRkoR9Y7B3ciWdn5eQ09SVhodIdMOa6fNP0D4=' 
  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"
    }
  }
}