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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a50a93b8ecbfde09b9e1aa5e2205a388d9fc72ab86907929c88ba9eb769ac0' 
  AND token = 'xcUJ5J8sX68/Xor3l4PWXwJi6Vb1mT/Wc9LjqpfwNoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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