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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb3878d9c40cd485c320e8c19efb89f5c6683797710a09ae80c59d5dd698266' 
  AND token = 'EBUL9RtHjKKZdvfKlscYBRA2vTA2wP9vPqqkmV4FElY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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