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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5dd68cf26a90ae5786eb44b1d8ae0ea929305c2aa80893abec93fc21f0d896' 
  AND token = '/N1ySMCKT112DfjQA0NQgfNPSbKLLN/SDdhPRUYsNUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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