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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9106e5b0e3af8364223bee230357590e8c1d092e023bc36cf5f037f40da7b7ac' 
  AND token = 'gGSlVTKtp9LSafmsQh4GKxpEILw29AuJ119Is0FAL+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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