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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5151ff8ebcfb17b09b89301f92583fab5e6eb5ebe4398503500a8338b3f3e084' 
  AND token = 'WawtcjJwln8U3kg/q/LB6sIryLWK4ml/jYnu2fUL/Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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