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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431724ba8a36a1b91a2d918e36b6fa89ab3a73e9f63a5cfce2f1c735fcfb964a' 
  AND token = 'A5dZKFI4ldjugLyn5XOFvL7SS+7/H13YtuvRDYu1SPo=' 
  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"
    }
  }
}