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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7a89e46ebc2fd84267b239af12b4082912d76905ad14abc89d9fd6fd5720d5' 
  AND token = 'S2E2y3bgsfY6Qvn74P1zYjaU7IvUOEWfnutni0FOm9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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