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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e4b0a3d4e022aad8869abcd0f8fb24e037ac7ff80ad58deec9acb58c9f817e' 
  AND token = 'm6xAdRefS5W4HViIzqRvJrG/0TfULhVTIxSuaG4mO8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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