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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b2a25bac95720dbae6524a87257d4603879ea30e2216464592570ced209340' 
  AND token = '12cjE4tVWcQp63/V385ak+CEIi9gRwOCtnn0pVP5OkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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