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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03281ec8b8f0a9d2c91c8d7bda903dea349035b4291380139132909f64c7f862' 
  AND token = 'NZAl1z5ILnNZ4IYWxTOPteUsR9CjMP0xpDxSIGYh9Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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