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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7126319f5ad2d4ea44f4d1e5f4df10fae7dabcbe56dc3f572ada8d9c74f42bc0' 
  AND token = '+q6OkaasSxYy4A/0DqiHzErX7dquOr5Hc0KlyhQuu7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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