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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2eaf5a7f5a45174b3059aac26d0ead17b1daffc431a0de9741a9cff7baae99' 
  AND token = 'cMF1rjaavyIYJ6ao+eMScp46qwj13roOaXceuGFfiig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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