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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b255203a40b0cd4b6ed64bcd1f377b9a2fed8773ea44a64c2d4fc36b2f3184' 
  AND token = 'MsFFnOLr/GwA6L8fQuWjK7dINRAhPO7PiBqmfRoNOEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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