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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85053dab024a2ad2643dafb303490de326d89743fc22a663d2bd4a02a39d15d9' 
  AND token = '5gA2hG+mU6ROIe3fzIOigyIEY5KO7lMUwWHCcIWMc4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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