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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da078f57849b35e22cfb5f6ed8c4c8e5fd37b868c898103565b66eeadc592ea' 
  AND token = 'EgdUFaNdlmu1A4fKLn8BUWZFqP9OSeMLkNMpbb1leB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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