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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7dd121636b6638c11f904d377de1eea2b9a2ae36b0ad4212400a43b79733486' 
  AND token = 'Xih1gnUyEso8/Av5u+/8WgmNiD1Rs9I0aP0EDOXwHrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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