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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4f6a68c4a7d024c91f9cecbbb50a557c3f9b7aa3b887d787d2558899a2257c' 
  AND token = 'ASbdM0N+Hl6KKCUrWj28ohKkwJXdI7A0vuGIMsMbn98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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