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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a792999af25e78aeacfcc57e6227915acf5ff8f2316473ff140e8142cf356fe' 
  AND token = 'y8E2yGU4dj6yWARmv6DT3j4Edfg6sh6XFkPbj0Gxuwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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