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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832a62e508a7ff492b425ea22d3c34445a0d4a16df84551dea1df29f7833ed9e' 
  AND token = 'ZSEUrMO7+KVBrj3M6QJKa9MDRxW9sDUQsivp3vR7fKw=' 
  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"
    }
  }
}