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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9544f104641e5f75fea505aae10facc2d39b3d2a2da111edbb039b3b0e32dda' 
  AND token = '/gu3C/0F0UI6UjKdU7CCj3O0TvL85LVfJ6ryY+eCEMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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