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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aab73600d79f04109afe67f05b0c7fbdc6c350f27f797329d793bce0474f03d' 
  AND token = '/L7RBpS48VNeHErz7zUqekbzGKu3eNCM1Zjw7rOrwZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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