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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c713bd80cef900d9b91070f3019a98e28047819ab5f405a2465532658448cf' 
  AND token = 't5cdzH027Lqs5FA/+zFenKx4WU4kqTLLLFqQs3q2LP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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