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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960cdea9a44f638e5fa25134225288f51db8a2b38dbd4445277a94478c5f5037' 
  AND token = '+na/OTG2oTQsraHn5rWQO4ktBs/6igKBVIYu6QoJTuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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