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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b66a25ed603c0bc73089e2cb4e8924f7e82163c8c20433a37a8bdd4428c7daa' 
  AND token = '7rfWjk4RSTfXEBO2lLjgkEcLSOredcjv4pA9URtQc1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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