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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23e475afaf9e5cff1dba9a49161ae1a31e7087017926c575ddae39d83e53495' 
  AND token = 'ekGDZJd75ac0bXUi2dO15BuZv1Cez9LN1W5IQJH4PC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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