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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93375d04a8785774f3ea2191169c83bbcd36bee88c3ca2f3e0d750c280d5ef1e' 
  AND token = '+67cMAlRzoPbJSIgf2eyfhsZfyG1HSHasYPkY1TWnEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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