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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac24e8d7bb602684f8caa0a9de8364574d964a6006bd73f6dac4a77f4155d3c' 
  AND token = '6JI6bCzcvTF8bCOUN7kGSutuq6Sa+DYqPklhGv8S+9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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