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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99d85badb45aef99d5d24fc00a02c019c0c733eabd737ac6c642a2a04b48f73' 
  AND token = '7j1vijJTX0ZCBcAeHCnx2s9OrI7DqN5aaRk+qlSwmP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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