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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a76a55140170e18387109baf1daf667e3be8f985713677e39a1c878b88d18b' 
  AND token = 'H/aVsQ7z4IEpL5xO5OYDbHEBOCUkD1HmrTarecVE5Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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