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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb24e1f62bb6ac6754e747502d82dc69fe2b52fdff7464d0ab42a9b38c00b548' 
  AND token = '47t3OcDj2pmZNcnzxsfu3rA8Pb1MfOjxk8LA3QHtGss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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