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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ff0c2647f83fde82dd858cebce62ffb9218f5bda80edcb47b12de1eddb844f' 
  AND token = '+OfgD+SUQxd338Vy1MziHfVn/ua7QGQxU00GQUMBi14=' 
  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"
    }
  }
}