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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157a7a530e1f43e8565a949a60942228efc5fbba34748f19a47e8c10bab411b9' 
  AND token = 'x/dx7C2rg0Ox07WB33wwQJtegIu3l6uLEVjf2hL55lo=' 
  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"
    }
  }
}