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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86ad40b3f06027fa1059b0fd8e030e18579f69456bf49152e9be223bb4a2e37' 
  AND token = '8AQppzTui9lUdgZU8Wmd35FH0A36PlP0t62yAHDvWOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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