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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bd0f6c5d9632435347ce95bdc80b8f3f789b8968e771057e533c9a4e5f8dc5' 
  AND token = 'Regw5lWqfVtgSgc/YKCtgkU1p4z0BqnTwSM7kX8yexI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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