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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c8ae354be7526b4b5b67705035531f3a3359eaf1766dbc7558403a5a4e0ae9' 
  AND token = 'zFD+QTtIb5yYh2K0d/itugO/JJ/xEjrOnTp2yDF8JRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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