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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b9df7c53435413342b6d354cd70da11d3a5e351e9a7ed9856ad29f408e233e' 
  AND token = 'r81Feti9XC+Sh4SzKJpiwKXdXRk2ku81F3s2jT9PP9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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