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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3673568e5d38363e8ed7f53a39f9fdd8f2f9335dbcb811e0cefe769ecbf5be22' 
  AND token = 'C+St3c2RtBLtJJizl1xpUbE2XR+SWm4CP7xpBrW/orE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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