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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7fe4bf0759f4843a5c15301148fb0128c914f30f7dc39553b3f25e0466df62' 
  AND token = '93ILNRXc4gbJOTQBIMwIN7p8jqRG0tXq8XZ1m4fLCjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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