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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027aad484986c90410cc026ac9e8a4e6788134bdcb125ba0518a80dd29b0c0f0' 
  AND token = '0by2VxqdzovB/QhfV8OiPu124bNnOLJ9slDlMaeTJZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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