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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f42cdd220b62048514c95fc92e5f939da5e2063819296aefd9dbaa263bab381' 
  AND token = '/4nGoMM8kDAzb/22gZE0ZH70A1i6bNMJBw4dUaMhOYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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