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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37548766dab54b77b2f2f55a2b0d5ca54db9dfc0daa47ab7db64dd14394bc20' 
  AND token = 'By7wRACS10DC/1nybnSdNw28DPj+Nl/nIiUFC57r53s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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