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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bac32edb7b281dc825a2d13a5c69bdd05f0c2384e96268a209fd56cf39a5f47' 
  AND token = 'UvWkUMRFTF0vgCVOpjj1dD+35e4b2TtifH8pyp6fFr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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