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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d38764c6b879d7b4c489e96c06af0823661c7cab0634c1085b3026182d7ae5a' 
  AND token = 'hQLl0yiv55yHUCaOLWCLtgktUn2PjyPvEMDeXUS/Otk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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