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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4f9a332a41d13828cc880b3490d20e3b266f7f6598594e8449757b671ee4ac' 
  AND token = 'zOPXgRgfAzd3YA44avbwUfRd3gZaXGRk2HFIXpUyTKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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