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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1725c88f06713e40bcee290e5313b20111a219f98f6462297f5ee8eac5542f' 
  AND token = 'WCyTaA66DsjQdNHcf+3tq3lBY2/ti68fSRk8agb4G5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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