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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd342cbb25f711ab40816c35c4c8fea2c2a884cf78307af4fd74d6eacfbb4be46' 
  AND token = 'HGMHQcXr7lSne4i5udY09qLfxE/vVql3aSG6C73Ki+c=' 
  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"
    }
  }
}